YouTube Volume Mouse Controller - With Alt Key

Modifies YouTube Volume Mouse Controller to only work with Alt + Mousewheel

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// ==UserScript==
// @name        YouTube Volume Mouse Controller - With Alt Key
// @version     1.0.3
// @description Modifies YouTube Volume Mouse Controller to only work with Alt + Mousewheel
// @match       *://www.youtube.com/*
// @grant       none
// @run-at      document-start
// @license MIT
// @namespace https://greasyfork.org/users/91424
// ==/UserScript==

(function() {
    'use strict';

    function handleWheelEvent(event) {
        if (event.srcElement.nodeName !== 'VIDEO') return;
        if (!event.altKey) {
            event.stopPropagation();
            event.stopImmediatePropagation();
        }
    }

    document.addEventListener('wheel', handleWheelEvent, { capture: true, passive: false });
    document.addEventListener('mousewheel', handleWheelEvent, { capture: true, passive: false });
    document.addEventListener('DOMMouseScroll', handleWheelEvent, { capture: true, passive: false });
})();